Find the determinant of the matrix

$M=$
 $\left.\vphantom{\begin{array}{c}\!\strut\\\!\strut\\\!\strut\\\!\strut\\\end{array}}\right[$ $2 + 2 x^3$ $2 - 2 x^2 + 4 x^3$ 0 $\left.\vphantom{\begin{array}{c}\!\strut\\\!\strut\\\!\strut\\\!\strut\\\end{array}}\right]$ $- x^3$ $1 + x^2 - 2 x^3$ 0 $10 + 6 x^2$ $20 + 12 x^2$ $-3 - 3 x^2$
,

and use the adjoint method to find $M^{-1}$.

${\rm det}(M)=$ ,

$M^{-1} =$
 $\left.\vphantom{\begin{array}{c}\!\strut\\\!\strut\\\!\strut\\\!\strut\\\end{array}}\right[$ $\left.\vphantom{\begin{array}{c}\!\strut\\\!\strut\\\!\strut\\\!\strut\\\end{array}}\right]$